/*
  <QAP.h>
  Copyright (C) DOLPHIN Project-Team, INRIA Lille Nord Europe, 2006-2009
  (C) OPAC Team, LIFL, 2002-2009

  The Van LUONG,  (The-Van.Luong@inria.fr)
  Mahmoud FATENE, (mahmoud.fatene@inria.fr)

  This software is governed by the CeCILL license under French law and
  abiding by the rules of distribution of free software.  You can  use,
  modify and/ or redistribute the software under the terms of the CeCILL
  license as circulated by CEA, CNRS and INRIA at the following URL
  "http://www.cecill.info".

  As a counterpart to the access to the source code and  rights to copy,
  modify and redistribute granted by the license, users are provided only
  with a limited warranty  and the software's author,  the holder of the
  economic rights,  and the successive licensors  have only  limited liability.

  In this respect, the user's attention is drawn to the risks associated
  with loading,  using,  modifying and/or developing or reproducing the
  software by the user in light of its specific status of free software,
  that may mean  that it is complicated to manipulate,  and  that  also
  therefore means  that it is reserved for developers  and  experienced
  professionals having in-depth computer knowledge. Users are therefore
  encouraged to load and test the software's suitability as regards their
  requirements in conditions enabling the security of their systems and/or
  data to be ensured and,  more generally, to use and operate it in the
  same conditions as regards security.
  The fact that you are presently reading this means that you have had
  knowledge of the CeCILL license and that you accept its terms.

  ParadisEO WebSite : http://paradiseo.gforge.inria.fr
  Contact: paradiseo-help@lists.gforge.inria.fr
*/


#ifndef QAP_H
#define QAP_H

#include <eo>

/* global variables */
extern int n; // size
extern int** a; // matrix A
extern int** b; // matrix B

class Problem : public EO<eoMinimizingFitness> { 

public:   
 
  int* solution; 

  Problem () {
    solution = new int[n];
    create();
  } 

  Problem (const Problem & _problem){ // copy constructor
    solution = new int[n];
    for (int i = 0; i < n ; i++){
      solution[i] = _problem.solution[i];
    }
    if (!_problem.invalid()) // if the solution has already been evaluated
      fitness(_problem.fitness()); // copy the fitness 
  }

  ~Problem(){ // destructor
    delete[] solution;
  }

  void operator= (const Problem & _problem){ // copy assignment operator
    for (int i = 0; i < n ; i++){
      solution[i] = _problem.solution[i];
    }
    fitness(_problem.fitness()); // copy the fitness 
  }  
  
  int& operator[] (unsigned i)
  {
  	return solution[i];	
  }

 
  void create(){ // create and initialize a solution
    int random, temp;
    for (int i=0; i< n; i++) 
      solution[i]=i;
    
    // we want a random permutation so we shuffle
    for (int i = 0; i < n; i++){
      random = rand()%(n-i) + i;
      temp = solution[i];
      solution[i] = solution[random];
      solution[random] = temp;
    }
  }

  int evaluate() { // evaluate the solution
    int cost=0;
    for (int i=0; i<n; i++)
      for (int j=0; j<n; j++)
	cost += a[i][j] * b[solution[i]][solution[j]]; 
    
    return cost;
  }


  void printSolution() {
   for (int i = 0; i < n ; i++)
     std::cout << solution[i] << " " ;
 
   std::cout << std::endl;
  }
 
 
};
#endif
